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5.13's or 4.88's in 1/2 tons

Discussion in 'The Garage' started by Hossbaby50, Feb 27, 2003.

  1. Hossbaby50

    Hossbaby50 3/4 ton status

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    5.13\'s or 4.88\'s in 1/2 tons

    I am going to build myself a light rock rig. I am running 1/2 ton gear, and I want max reduction.

    Will 5.13's or 4.88's survive in 1/2 ton gear? Or is the pinion just to small?

    Here are the projected rig specs.

    250 I-6 motor
    700R4 trans
    NP241 case (possibly a Klune V 2.72 box also)
    10 bolt front
    12 bolt rear
    35-37" tires

    The rig is going to be pretty gutted. Only 2 seats, truck tool box, rollcage, and gas tank. Can the 4.88's or 5.13's survive? Anyone with experience? Thanks

    Harley
     
  2. sled_dog

    sled_dog 1 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I wouldn't really recommend 10 bolt for rocking. Low torque engine but still slightly larger tires, a 12 bolt would be a better choice. I don't understand the question now, what do you mean will they survive? You mean will they break cause its a week 10 bolt.
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    The 10b 4.88 pinion isnt as small as some think. I bought a set I never used and took some pics of them to sell. Maybe I can find the pics to post. In them I am holding the pinion and I have fairly large hands so its a decent idea of what they look like. Ill see if I can find it.

    Nope I deleted the album. Sorry. If you want to see them I can upload the pic again.
     
  4. crwln73

    crwln73 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I wheeled for 12 years with a 10 bolt front and rear with 36" tires.Mostly in the rocks.You just have to know your limitations and not try to power up anything.In all those years I never broke a single axle.
    Oh yeah I was locked with 4.56s
     
  5. Flexy K20

    Flexy K20 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    My friend has 5.13's in a 10 Bolt front with a 396 BB, and 39.5" tires. I have seen him really beat on that axle and he has only broken one shaft, and that was towing someone out. He has had no problems. I would'nt worry about it too much. Also if you are going to run a 12 bolt rear you might want to look at Warn's Full Floater kit. It would definitly add some strength, and if you did break a shaft at least your wheel would'nt fall off. Later
    -fLeXy K20
     
  6. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    The 10 bolt is going to be the front. The fronts can hold up. The rear axle is going to be a 12 bolt.

    The question is about the pinion gear size. As the number increases (4.56, 4.88, 5.13) the pinion gear gets smaller. I have held a 4.56 pinion gear and I thought it was a little small, and the 4.88 or 5.13 would be worse.

    I know I will probably break some front axles, which is no big deal, but I can't afford to break pinion gears.

    Rear axle is going to be a 12 bolt with alloy axles. DesertDueler (Dan) has alloys in his 12 bolt and 38.5" Swampers and it holds in a Burb, so they should hold a lighter Blazer.

    Harley
     
  7. Z3PR

    Z3PR Banned

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    Not sure on how those gears will stand up in the 1/2 ton axles, BUT, if you end up with a higher set of gears, think ORD Doubler.
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    If it isn't a hassle I would like to see the pic. I would appreciate it.

    Flexy, I am glad to hear that 5.13's might hold on in 1/2 tons. As for the full float, I might use that if I start to break alloy shafts. All the guys in AZ seem to have problems breaking stock shafts, so I think I can survive with the alloy.
     
  9. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    Ya, to much $ though. If I do decide I need lower gear I will do it in another more unique fashion. Since I want to run a 241 I would use a Klune V underdrive box. They bolt right up. Plus all the guys in AZ run Doublers, and I want to be different (as if a 250 I6 isn't different enough).

    Worse comes to worse I can sell the 241 with Klune V to some Heeper and get a doubler. Plus doublers HEAVY. I am trying to stay as light as possible.

    Harley
     
  10. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I actually was just on Randy's R&P and they show gears down to 5.38 for the GM 12T & GM 10 bolt axles. So include this in the is it strong enough question. Thanks

    Harley
     
  11. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    Itll be tommorow before I can do it now. PM me to remind me, Im about to hit the sack.
     
  12. zakk

    zakk 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    with the 700R i would say 5.13's. I don't know enuff about the pinion strength of 1/2 ton stuff, but in a pefect world, the 5.13's would help make up for the I6.
     
  13. txbartman

    txbartman 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I ran 4.56s for a while in my 10s. I would not recommend going as tall as 5.13s. I would stick with 4.88s and call it a happy medium.
     
  14. 79Beast

    79Beast 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    If you're gonna have the bottom end torque of an inline six combined with the gear reduction of a TH700, NP241, and a Klune-V, I'd stay with a stronger gear...like a 4.10 or 4.56. For a light vehicle with an auto tranny, you don't need but just so much gear reduction...especially with a 38" or smaller tire.
     
  15. Mudzer

    Mudzer 1/2 ton status Author

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I had 4.88's in my 1/2 ton gear and they lasted about 2 wheeling trips. Not exactly a good number. I will admit, I (well, maybe it was theBigdaddyof2 driving) was ramroding it somewhat when the 12 bolt 4.88's let go. I sheared 3 teeth off the ring gear. The problem with smaller amount of teeth on the pinion isn't weaker 'cause it's smaller; it is because you only have about 2-3 teeth on the pinion contacting the ring gear. This puts tremendous stress on the ring gear and chews teeth. On the contrary, I have seen Steve Frisbie wheel the pee out of his rig with 4.88's in 1/2 ton gear. He went the same places 1 ton gear went at BB02.

    I would stick with 4.56 gears and a Doubler. You will find the limits of your 1/2 ton gear are going to be the Ring Gear and Pinion. Buy some Volvo Portals and never look back!!! /forums/images/graemlins/thumb.gif
     
  16. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I don't think I am going to actually run the Klune V unless I decide I really need alot more gear which I don't think I will need.

    I was actually thinking about running the 5.13 or 5.38 for the fact that it would be a good highway gear for the 37's and the lack upper power in the I6. Now I will have to do some more research and digging and find out about the strength of the gearsets.
     
  17. DesertDueler

    DesertDueler 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    I would say stick with 4.56s or 4.88s. Anything bigger, and the pinion does get alot smaller. Just remeber that the crawl ratio is alomst the same if you run a th350/doubler/3.73 gears, as it is with a 700r4/241/4.56 gears.

    Dan /forums/images/graemlins/burb.gif
     
  18. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    Ill get those pics up soon. I am thinking about changing from Webshots since they are restricting so much now. I dont want to add anything for fear itll throw up a flag or somethin.
     
  19. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    OK I got an new album and Ill start uploading pics tonite. Its Imagestation and hopefully I can post pic now too.

    Oh and I CANT upload anything to my Webshots now. Guess Im doing good that they havent locked out most of my albums yet like they have others here. /forums/images/graemlins/angryfire.gif
     
  20. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: 5.13\'s or 4.88\'s in 1/2 tons

    OK bear w/ me this MAY not work! But here goes nuttin.... OK I cant get an image to work here for some reason. AWWW WTH! Now I cant even figure out links! AHHHHHHHHHHHHHHHH!

    I have the pic up, just give me some time to figure this out.
     

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